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The submillimetre view of massive clusters at z ∼ 0.8–1.6

Cooke, E.A. and Smail, I. and Stach, S.M. and Swinbank, A.M. and Bower, R.G. and Chen, C-C. and Koyama, Y. and Thomson, A.P. (2019) 'The submillimetre view of massive clusters at z ∼ 0.8–1.6.', Monthly notices of the Royal Astronomical Society., 486 (3). pp. 3047-3058.

Abstract

We analyse 850 μm continuum observations of eight massive X-ray detected galaxy clusters at z ∼ 0.8–1.6 taken with SCUBA-2 on the James Clerk Maxwell Telescope. We find an average overdensity of 850 μm-selected sources of a factor of 4 ± 2 per cluster within the central 1 Mpc compared to the field. We investigate the multiwavelength properties of these sources and identify 34 infrared counterparts to 26 SCUBA-2 sources. Their colours suggest that the majority of these counterparts are probable cluster members. We use the multi-wavelength far-infrared photometry to measure the total luminosities and total cluster star-formation rates demonstrating that they are roughly three orders of magnitude higher than local clusters. We predict the H-band luminosities of the descendants of our cluster submillimetre galaxies and find that their stellar luminosity distribution is consistent with that of passive elliptical galaxies in z ∼ 0 clusters. Together, the faded descendants of the passive cluster population already in place at z ∼ 1 and the cluster submillimetre galaxies are able to account for the total luminosity function of early-type cluster galaxies at z ∼ 0. This suggests that the majority of the luminous passive population in z ∼ 0 clusters are likely to have formed at z ≫ 1 through an extreme, dust-obscured starburst event.

Item Type:Article
Full text:Publisher-imposed embargo
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1093/mnras/stz955
Publisher statement:© 2019 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society.
Date accepted:29 March 2019
Date deposited:04 April 2019
Date of first online publication:30 April 2019
Date first made open access:No date available

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